stage: Stage's Grand fir (Abies grandis (Dougl) Lindl.) tree...

In FAwR: Functions and Datasets for "Forest Analytics with R"

Stage's Grand fir (Abies grandis (Dougl) Lindl.) tree measurement data

Description

The data are internal stem measures from 66 trees. The trees were selected as having been dominant throughout their lives with no visible evidence of damage or forks. The trees came from stands throughout the inland range of the species.

Usage

data(stage)

Format

A data frame with 542 observations on the following 11 variables.

Tree.ID

A factor uniquely identifying the tree.

Forest

An integer distinguishing the forest.

HabType

An integer distinguishing the habitat type.

Decade

The decade of the trees life represented by the observation.

Dbhib

Diameter (in.) at 1.37 m (4'6”) inside bark.

Height

Height of tree (ft)

Age

Age of tree at felling

Forest.ID

The national forest in which the tree was felled.

Hab.ID

Daubenmmire's (1952) classification of the local growing conditions: Ts/Pac Ts/Op Th/Pach AG/Pach PA/Pach

dbhib.cm

Diameter (cm.) at 1.37 m (4'6”) inside bark.

height.m

Height of tree (m)

Details

Quoting Stage (1963), "After felling, the total height was measured, and the age at breast height was determined by counting the rings on a crossection. Then, decadal height growth was measured, starting from the termination of the 1956 height growth. The count of whorls was checked by a ring count at every decadal point. ... Diameters at breast height (measuread along an average radius with a scale having 10 graduations per half inch) corresponding to each decadal height point were also recorded."

The national forests are: Kaniksu, Coeur d'Alene, St. Joe, Clearwater, Nez Perce, Clark Fork, Umatilla, Wallowa, and Payette.

Source

Stage, A. 1963. A mathematical approach to polymorphic site index curves for grand fir. Forest Science 9(2) 167-180.

References

Robinson, A.P., and J.D. Hamann. 2010. Forest Analytics with R: an Introduction. Springer.

Examples

data(stage)
str(stage) 

FAwR documentation built on June 22, 2025, 5:07 p.m.